Vulnerability · Published Aug 31, 2026 · Assigned by EEF

CVE-2026-82579AshAi tool loop never terminates when all tool calls are filtered out, enabling denial of service

Medium 6.0

In plain English

A medium-severity infinite loop in ash_ai from ash-project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities).

Severity (CVSS 4.0)6.0Medium

Exploit odds (30 days)0.5%top 59.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Loop with Unreachable Exit Condition (Infinite Loop) vulnerability in ash-project ash_ai allows an attacker who can influence a model's output to hang the tool loop and drive unbounded, repeated model requests. AshAi.ToolLoop classifies a model response of :tool_calls, then filters the calls through normalize_tool_calls/2 and unprocessed_tool_calls/2. Both can empty the list: a call missing a valid name, or one reusing a tool_call_id that already has a result in history, is dropped. With an empty list the loop appended nothing and recursed with a byte-identical message list, so the conversation never advanced and the same request was re-sent every iteration. Under the supported max_iterations: :infinity this never terminated; otherwise it exhausted the full budget. Prompt-injected content can make the model re-emit a spent tool_call_id. The fix treats an empty post-filter list as terminal. This issue affects ash_ai: from 0.6.0 before 1.0.0.

Affected products (as reported)

Vendor	Product	Versions
ash-project	ash_ai	0.6.0 – before 1.0.0
ash-project	ash_ai	bc2122f78fca6c11d8ec2b9ac53148ec17476460 – before 53325fdab90afab628c6a53232ef2a9001580bd9

Weakness: CWE-835 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

https://github.com/ash-project/ash_ai/security/advisories/GHSA-rcx7-x2w5-mmc2 vendor-advisory, related
https://cna.erlef.org/cves/CVE-2026-82579.html related
https://osv.dev/vulnerability/EEF-CVE-2026-82579 related
https://github.com/ash-project/ash_ai/commit/53325fdab90afab628c6a53232ef2a9001580bd9 patch